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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9823b91ffae0f07f23ea283e13fc72473a988494ad1f95c1eb11022100b5394a' 
  AND token = '6kAf8mm72gEd67WbuOFq/Jo7u3CSYlqtejNxogx71B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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