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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ea29d81ae6921c462feda4fd4c6ee87e77221a762b784e5c561cfe67701e70' 
  AND token = 'LzK5jmCaUvzHK6GvVRR7mhG2mUANCJok+GWcF4HgI/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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