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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd114f3b645cc0f15efcfd90aece8fc478fabf5be04a451c0aaaa8eb7215a4e3a' 
  AND token = '79jTMX2XZggc0JIj1kjC001PWaNrOBqrbtSTEUysk0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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