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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf233ca847be5dfab8d55b40d9ae11e0e92270ebf0c3400d62ca7a2aa7369da7' 
  AND token = 'M/F/8EkieHoZXdrEt5OLww3cETMnsCLkSjc5P0qfRDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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