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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26167e44dfbf9bdf64b04a79c0027dc4b63aa0b9e09dfe579d89448430052d39' 
  AND token = 'xPSnVKRDhap5/mgn0oSAkSVmx/kYjw6MVHkUVN4fRv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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