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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f67e38ac0e8a2a4401ec8291371bcfe07a98f381539031acab6e96aa255acc' 
  AND token = 'vhBOMFEvdL8wlbupbHgdGl1b2Qq4wwi7eHy+WAt98CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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