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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540afae10beb3b5473b2805fabe16dc1aefd74e1231bd7d5fec66b6621dea7d6' 
  AND token = '9WWlhyZ4jcyDQuiOgh7XZO3dAeIbYSuzUsc7bQkITyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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