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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5f85645cfe7a19cdf2c852d4dfdbcf582a14285988441d6277a1da60c16a40' 
  AND token = 'lfxfoka05Q3M3gcSTstwBYryUGm+UE+KX2EbF1Qc0lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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