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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a6f4af307b8e7ee62322c44981fcd736d67107b14e8e5cbb0765fa8d72b8e8' 
  AND token = 'ARGq7AowMjsU7DFa5SBvxamcjZM9afnMS+4UViJs1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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