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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7399c00384fa7c0fe91428d86e7e31a0b8fdc74e875891d4bae9e27a87579ff9' 
  AND token = 'suO4+xGZE8Ua1JIM07pOPUpW47MvyNqGMRFE7qldO24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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