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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abc68491588af3bbae0b637b9bab1b5fbb75c33bdfe68b5de45feabfd4ca60b' 
  AND token = 't1pkBn08VRHWMLq/1ILq3IN0WlnVlI3i+bNxABDL3FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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