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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cf555abfc9233c12012f08e3454ccd0da2960c2f42ffa7c6a019caeb0d6e03' 
  AND token = 'D/uQqvFkS3O5GB5eWbNcFT104V6hyLgk1tAt+saqCj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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