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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40812bc7bb38f3e3aa8fc441c920fcdc7d6755fdcb8040c35eea1a0775454c0' 
  AND token = 'jKFu8cGW8gGlvkZNIbnFOIRLla8xxZuVZqjpJgApaQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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