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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b541158df850b5a06d7bce0426451d6823e70053ce33858f3e3c3bb8804f5866' 
  AND token = 'y1u/k+xYpavQ0f3+uqtvGy/7/fhEcs3eSYh35WBGSX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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