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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f21a32411f78b33fcf0b9a61cb79004e24bba6e73bf5ea521715dc92ba2214b' 
  AND token = 'SNpQjBjAdewi8MohlzY+doYHLY89iEEb8sN0zKTW0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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