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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e048f78e00c457a83112c1f5ce68f05230c47a3e1d64eb2caa2b474fe8026c1' 
  AND token = 'uLKmEDxTxFfXIl54l599g8Kn/hUyPLk3uY/zb7yvRpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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