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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa8b9fe86936e2181faf3251bd01814f26e18aa6f9c87dc4f64a1ded8762659' 
  AND token = 'R+fXE4zFBpY5IzK+J+F1ZBgIz955kzWZAQen6hpdXOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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