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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e463368200c11525b3af0739e97436d4dca2b8c4863f821bc1dd4be3a4ea8e' 
  AND token = '2PRkymTPTobx98FdnVD5pzOMwD35pbyMLD2EfUjL5AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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