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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637c348c0a0f576c45e7a8c5545b91be2a9df7923fb8f3e3e4cb661f4f059639' 
  AND token = '3sOG5AMMF4gI3SKGJraJ1fzdgDLLrvWjR1MBof/5/mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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