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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6018fda4a301499e631b6941e5c8374188d5f75c5dc65675c01169a37a4618' 
  AND token = 'LCAlookL6SojjSJZMtJe7GRhEN2xDGkDAS/xY8tHbEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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