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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c52d6b54cdaa61ff4657f9c031db483e0b522129888a3417ce62346877d249' 
  AND token = '3PMEmafDF29ontush4EGaCEE2lEHFMN2VIwiQaolE2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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