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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9794ed12bd30a0a1c32f3c7527ebf1631d44288cd24bcfc4abe8c3e07437f5e7' 
  AND token = 'cp7Jw+KRMeJ1Xp3nyc+BdtXRG2aTVU/6/3MNFDFG2Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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