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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945ddd3b1fc3d920e43d4977dd079c63f7168943c0d1f9e0c0115613b4e56fe0' 
  AND token = 'rSh+Aap6t9iywo3VX1ZYIal03BjA7rvZA4nYop5w99Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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