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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0813dc1a9511086caad04aa997741a661f8035a8a9d957c8a621207248653e6' 
  AND token = 'ejFcEU80Z9ptJ/t6qz1cDMFbjfhu2watfT1M/xIVh1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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