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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361454107f195b29c095181bf485133df97bd440f14400ace5c48efb8af10e85' 
  AND token = 'xDi51MOjEwotz/z692mvfO7CTa46JzGtO5xQLkeQFNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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