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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c507e062ab3932f0c25af8728d8055bcb784ea34e59904dc26911c52861f861' 
  AND token = 'NJtcsA/9Y55Tx33WG0RXcIZjoRHrRfu4VI78FWL8t8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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