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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513a04814e5fb505353583c72f9a68d5042f11f5a45fd78c34d91509f0fb4392' 
  AND token = '3qEnQ0eXY2tnsXl16j/QVCPFYqYnp+ZjySbP5aL7a7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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