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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ae458fa20cf5d08c22f22bf6cac2c322ad7aea62408d0b8bf5f135cb39d1d6' 
  AND token = 'eYz5FIau0dODPqPpb5PCgJO8Sbh8DPAStHYU9PGlnJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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