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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8a1a5cc1d5452ba5a426f8635173456390962f2a7f64d8c5de4907a0aeaac5' 
  AND token = '3Pi9Hxeie70MziinNix9X3OlWsbHepE7+aCKQI36TN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}