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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f21755348e07cf4e5389144f5df234f2aa8ecc10ee717929e97e86a6c9f6d91' 
  AND token = 'LraNgckRAX7lKKwb/mrLJckvNNUHhePtWzMSGA0KAdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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