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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b53486ec9d2dae593de767d6b7f3beb2403141de392da12cc716d54cfc9bf77' 
  AND token = 'bnZHmQCW74OH0gJwLSmvYmWo3BmHRdbmr3l1thGUu6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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