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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d97b7803ba0ab010d8f2300fff5927ffbb44441bb562e92a246f86663b375e' 
  AND token = 'xFxqNL9Tccyls3gX7FaUaymV5TWG+NXB1aQ1DIQQmE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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