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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf305fb27dc2771ddebe4f53fb191c4f44ed2aa8407681d23322e46341e57ef' 
  AND token = 'lLeQyfvR1MrLQLxDRQZSe6rxPGUfsg0EDGkb2i1O6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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