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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5abf308f421b18b57d9c85b47cca25db50d72b076de5c958cb13d4a873fa8f4' 
  AND token = 'J+FfVZEKgQqrqd4SGuKP+2nkcapbUeZ6166t2UemLpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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