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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcfd81fcc4fb091b9d8877032bb221d567b0ff2db789a58ee6035a8d7697c34' 
  AND token = 'I+bU1lXV8dG8BE0rIkaRLa818yL/jtmWeniF4y+OASw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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