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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6faa434333fc9dab3b75d922a3b97ad28e9d7e3f55760410f3e695ea60c9d5d6' 
  AND token = '+bsnQ9BDc62pZOe/PMMgHmN4acCA0tVS/CdPuXonY34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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