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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe01a65af3a4ef5ed5f5278570bd9dd2923273cb70071205b1adee067e53440' 
  AND token = '4iDolYm82RGnQFagmm2BBM0JNNrTRc7TS/cl6N3BdVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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