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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f7292a12026901325de6f439d97762a2b3ce3cb245ecd9e9f1abd4098ed7bf' 
  AND token = '7dr2jnJc1fkIN9gt/VqF9Et3C5EK4KuqufoMkilKCx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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