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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eccd9a41b62ab491f9c19846d8ca7a0e1f3c72d68544120892164d112cb7ae' 
  AND token = 'WN9/Y1MzNolz4mN6/rn50dOfGa37Nho99/akt1i9wMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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