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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8ad3015f33953d396bccc8c49369872670d18169a522997881827240ceb0c4' 
  AND token = '3825WEmkSjaKk9EeiwGeUqvgRG0XdCCyA6Wp1DO45tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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