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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fcdfc0ab3191d4823f4cb15ceb3718db9f97e27dbfe688a786f4716820628f' 
  AND token = 'XT68icmcDY4G+pA5rQ41dH5RKDhKLZKUWG0fvMCaUgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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