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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213f621203b0cc1d63573f681e20748dc0533576d3846457d85ab03b79b0797b' 
  AND token = 'K8NtBzJpb3kN6KHzNuWW2rFcJuej0jZ+hO9Ru9K9kjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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