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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9363d223dc38866dcbd881dccbc5103d94898290afd87b4ea813301092ea63f6' 
  AND token = 'H+OXZkA3Q3fy1Vp01ZvYHhlHe2wie2kLkA5Arp1bDjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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