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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3db298be70cdabe32ea892cbd1adda7ac43db87a07ad541973dfa34035d52f' 
  AND token = '8uNWCVJeZ75wCvc8RD3vC9xRG0qJufDLwA3XIAm9Yp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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