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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f35a4ac94a6b1b4cb8d7713c23f5ff46fa41eae6615d89e2c98e0928159c11b' 
  AND token = 'nM0K5dr//svenDoC92V4aPpOx0hef3xo1g1OXsSmQns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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