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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b54b847252082aacaf85e8c067ae22d9e22a330a61851fa5e3a4d441def2cd' 
  AND token = 'eJ+y/300LvSQx8zVElmR5N2twMJqoXPjGf0WSMhuYR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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