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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fdc49c1a3e58bc09bf7f7ae12fd049bba1c69a27f104f71aa52bcf1b265db9' 
  AND token = 'gpUbEhoxtOq75MrBn2I+VTJSKCxSuKWshf70QAvn/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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