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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafb8bb1bf095bb4924f16dd46d77cddde1fb818a6ce33df2a77768b9029727e' 
  AND token = 'nNY0Qf6MkxvZI9BD+5rbDtu0w0l79x57KM+WAgmXZ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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