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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c9e51c4107c8255365ade5ebe101584560a65f0fe11082c59de3580dc093b9' 
  AND token = 'rVCKhorF3kNIbcfdO6WinIkuPZ20oy7BjXc0ZEHAgPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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