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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee641c9755338bf8f92444428f9c1d1bf963dd1cf025194bab243a41c45ad93' 
  AND token = 'YAFhh1zdsUDNiqR7Am0skQCSbhy85SSupbn8Fg5kr6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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