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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7dc2378d5fe400756507ad34ffd8f5ff33b7d4ea597e95da548230ea3882fa7' 
  AND token = '1rmthyYCTeGK0+McJnIU/6oT2acuh2uU28P51gf6WBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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