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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac38f18854de66dbf85ed07714fe17b7167c55406871ed482bf2791a32c2109f' 
  AND token = 'FAysQda3XUPA7ND6O2ymZw7BTkGRJrr1K3rTT3oR0u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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