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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d668054aa8dc9af032807425d8c51325c83592b799ec76071fc65f884281fc3' 
  AND token = 'D6OB6CqstRpJbvWntOx4M+f6Q+9QX8YQb6Lj08fRjmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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