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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71409a036a513cae9fdd68d3f20aae55b005e9347095238e5dfe96980b077f71' 
  AND token = 'fkHlMayusbXMyrLI8bhBEFds+22DEjFV1wM42NnO+/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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