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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5568607986e221800983b26b1d931d4172cbd9c631c920638a0e935f85a8cee' 
  AND token = 'rtROF73XIpdaAyR8e4OeoNf+1cZfhaYvQVteNB1H4rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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