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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302a832bf5a509be887f1e3eb1b134ddcade88c6b4db73aa9d7502839fdacbbd' 
  AND token = 'jZIcsZVpjlEPa4NXqPACnYibu1Lv63KW1XD4rGpAJ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00139

JSON explain

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